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Global warming is bigger than the Bomb.
It's not as big as the collapse and expansion of the Sun. That will destroy our planet early in a violent process a few billion years from now.
But it's big.
It's bigger than the death of the Neanderthals,* our biggest kill so far.
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* There's no concensus about the demise of Homo Neanderthalensis, a species of people gone extinct about 30,000 years ago. Indeed, a genetic study in 2010 showed that all modern humans who are not sub-Saharan are between 1 and 4 percent Neanderthal.